Holley 1920 Replacement Question

Justin,

Remove the air cleaner cover and you can see the choke work. BTW, if you drop anything down the throat, don't run the engine until you recover it. The choke should be closed, with some spring force, when cold. The second the engine fires, the "choke pull-off" should get manifold vacuum to slightly pop the choke open (manual gives spec). If not, the engine will die from "too rich". After that, it will slowly open as the exhaust manifold (and electric assist) heat up to operate the coiled thermal spring. To check the pull-off, remove the vacuum hose, push the stem in, block vac port w/ finger and see if the stem stays in. Of course it will extend slightly until vaccum builds, but won't go out fully until you remove your finger. Also, check that the vac hose isn't cracked and goes to a port near the bottom of the carb.

To answer the earlier 2 bbl question, those were Carter BBD. They appear much more available since also used on most small block engines (318). I bought a new one on ebay for $25 a few years back (for my 65 273). The slant ones might differ slightly, though many here run ones for a small block. Also, look for the Holley "Econo-master" of the 1980's. I recall there was a BBD replacement. Some complained "too restricted" for a V-8, but might be perfect for a slant.